REST API Add Purchase Line to an OPEN Purchase Order

Summary:

We would like to add a NEW line on a Open Purchase Order.

We have successfully updated a PO Line with the following PAYLOAD :

Resource : /fscmRestApi/resources/11.13.18.05/draftPurchaseOrders/300000010227038

{
"ChangeOrderDescription" : "change_B_order",
"ChangeOrderInitiatingParty" : "BUYER",
"lines" : [
{
"POLineId" : 300000010135723,
"Amount" : 8000
}
]
}

We have tried to do the same operation to add a new line to the PO but it was unsuccessful

Can someone provide a Payload please ?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

25D

Code Snippet (add any code snippets that support your topic, if applicable):